Tulipversion 2.0.5 released

This is a new release: addsupport for GCC 4 and Mac OS X 10.4, add groups of plugins, fix ofseveral bugs

details : Tulipis now exclusively build on Mac OS X 10.4 (Tiger platform) and adownloadable disk image is available on Sourceforge for this platform.Plugingroups have added allowing the use of plugin submenus in the tulipgraphical interface.Rendering of edges has been improved.Asevere bug on 3D label rendering (due to FTGL 2.1 port in 2.0.4 release)has been fixed.